blocks|key|5311321|text|这取决于重命名文件的范围。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5311322|如果您想要重命名文件以保证唯一性，那么大多数库都将为您处理此问题，因此您无需执行任何操作。|5311323|如果你想给它一个自定义名称，你不能在上传之前这样做，但你可以很容易地在上传之后这样做。|5311324|下面是一个使用koa-body的工作示例|offset|length|5311325|//+use+this+as+first+middleware
app.use(require('koa-body')({
++++formidable:+{
++++++++uploadDir:+__dirname+%2B+'/public/uploads',+//+upload+directory
++++++++keepExtensions:+true+//+keep+file+extensions
++++},
++++multipart:+true,
++++urlencoded:+true,
}));|code-block|syntax|javascript|5311326|然后在你的路线上|5311327|router.post('/upload-file',+async+function+(ctx,+next)+{
++++//+file_param+is+the+request+parameter+name
++++let+filePath+=+ctx.request.body.files.file_param.path

++++//+rename+file
++++fs.renameSync(filePath+,+'/path/to/your_new_file');
})|5311328|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/koa-body^0|0|0|0|7|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$H|14|I|15|1|16]]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|19|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

That depends on the scope of renaming the file. 

If you want to rename the file for uniqueness, then most of the libraries will handle that for you, so you don't have to do anything.

If you want to give it a custom name, you can't do that before upload, but you can easily do it after.

Here is a working example using <a href="https://www.npmjs.com/package/koa-body" rel="nofollow noreferrer">koa-body</a>

<pre><code>// use this as first middleware
app.use(require('koa-body')({
 formidable: {
 uploadDir: __dirname + '/public/uploads', // upload directory
 keepExtensions: true // keep file extensions
 },
 multipart: true,
 urlencoded: true,
}));
</code></pre>

Then in your route

<pre><code>router.post('/upload-file', async function (ctx, next) {
 // file_param is the request parameter name
 let filePath = ctx.request.body.files.file_param.path

 // rename file
 fs.renameSync(filePath , '/path/to/your_new_file');
})
</code></pre>

blocks|key|2657748|text|您可能会想要使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2657749|https://github.com/dlau/koa-body|offset|length|2657750|2657751|函数{+onFileBegin+}文件开始时的特殊回调。该函数由formidable直接执行。它可用于在将文件保存到磁盘之前对文件进行重命名。See+the+docs|blockquote|2657752|2657753|entityMap|0|LINK|mutability|MUTABLE|url|1|https://github.com/felixge/node-formidable#filebegin.^0|0|0|W|0|0|0|1Z|C|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]|R|$5|N|O|P|A|$Q|S]]]]

Probably you'll want to use this:

<a href="https://github.com/dlau/koa-body" rel="nofollow noreferrer">https://github.com/dlau/koa-body</a> 

<blockquote>
 onFileBegin {Function} Special callback on file begin. The function is executed directly by formidable. It can be used to rename files before saving them to disk. <a href="https://github.com/felixge/node-formidable#filebegin." rel="nofollow noreferrer">See the docs</a>
</blockquote>

blocks|key|2657755|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2657756|app.use(koaBody({
++multipart:true,
++encoding:'gzip',
++formidable:{
++++uploadDir:path.join(__dirname,'public/upload'),
++++keepExtensions:+true,
++++maxFieldsSize:2+*+1024+*+1024,
++++onFileBegin:(name,file)+=>+{
++++++const+dir+=+path.join(__dirname,`public/upload/}`);
++++++file.path+=+`${dir}/newPath/newFileName.png`;
++++},
++++onError:(err)=>{
++++++console.log(err);
++++}
++}
}));|code-block|syntax|javascript|2657757|2657758|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>app.use(koaBody({
 multipart:true,
 encoding:'gzip',
 formidable:{
 uploadDir:path.join(__dirname,'public/upload'),
 keepExtensions: true,
 maxFieldsSize:2 * 1024 * 1024,
 onFileBegin:(name,file) =&gt; {
 const dir = path.join(__dirname,`public/upload/}`);
 file.path = `${dir}/newPath/newFileName.png`;
 },
 onError:(err)=&gt;{
 console.log(err);
 }
 }
}));</code></pre>
</div>
</div>

I've only used <a href="https://github.com/koajs/bodyparser" rel="nofollow noreferrer">koa-bodyparser</a> and I just found out that It doesn't parser form-data that allows to upload files. so I'm trying these modules <a href="https://github.com/cojs/busboy" rel="nofollow noreferrer">co-busboy</a>, <a href="https://github.com/dlau/koa-body" rel="nofollow noreferrer">koa-body</a>, <a href="https://github.com/tunnckoCore/koa-better-body" rel="nofollow noreferrer">koa-better-body</a>. but I couldn't figure out how to rename the upload file before save it. since I've never done this before I want to know about how to do it. Any ideas?

Is there any way to rename the upload image with koa?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我只使用了，并且我刚刚发现它不能解析允许上传文件的表单数据。所以我尝试了，，这些模块。但是我不知道如何在保存之前重命名上传的文件。因为我以前从来没有这样做过，所以我想知道怎么做。有什么想法吗？

问有没有办法将上传的图片重命名为koa？
EN

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问有没有办法将上传的图片重命名为koa？EN